1
Status of the
European Green Crab in Oregon and Washington Estuaries
Final Report
November 2006
by
Sylvia Behrens Yamada,
Zoology Department,
Oregon State University
Corvallis, OR 97331-2914
541-737-5345; FAX: 541-737-0501;
yamadas@science.oregonstate.edu
and
Andrea Randall,
PO Box 6
Chinook, Washington 98614
jaos.kemmer@hotmail.com
Report prepared
for:
Stephen H. Phillips, Program Manager
Aquatic Nuisance Species Project
Pacific States Marine Fisheries Commission
205 SE Spokane Street, Suite 100
Portland, Oregon 97202
503-595-3100; Fax: 503 595-3232
stephen_phillips@psmfc.org
http://www.psmfc.org
2
Executive Summary
Following the last El Niño of 1997-98, a strong cohort of young green
crabs appeared in estuaries along the coasts of Oregon, Washington, and
on the west coast of Vancouver Island, British Columbia. Unusually strong
northward-moving coastal currents (up to 50 km/day from September 1997
to April 1998) must have transported green crab larvae from more
established source populations in California to the Northwest. Coastal
transport events have been much weaker in recent years.
It was hoped that green crabs would go extinct in the Pacific Northwest
once the original colonists reached the end of their life span of 6 years and
no new larvae arrived from California. From 2002 to 2004 green crab
catches in Oregon and Washington were only around 7 crabs per 100
traps. However, this population size appears to be large enough to keep
the population from going extinct. Local recruitment has occurred in
Oregon and Washington estuaries and inlets on the west coast of
Vancouver Island. Good recruitment in 2003, 2005 and 2006 is linked to
warm winters and shore-ward transport in late winter/early spring when
larvae are believed to be settling out from the plankton. The 2005 and
2006 year-classes are now the dominant cohorts in the Pacific Northwest,
thus assuring a larval source until 2012 when the last of these crabs will
die of old age.
Even though green crab abundance in the Pacific Northwest is still low
when compared to Europe, eastern North America, Tasmania and
California, it is imperative to continue monitoring efforts for two reasons:
1) to elucidate the process of range expansion and population persistence of this
model non-indigenous marine species with planktonic larvae and
2) to understand the role of ocean conditions on recruitment strength in order to
predict the next strong recruitment event of green crabs.
Outreach efforts to educate the general public, including boaters and
shellfish growers, not to transport non-native Aquatic Nuisance Species
(ANS) from one area to another should continue. Such efforts could delay
the spread and establishment of the green crab in the inland sea between
Vancouver Island and the mainland, including Puget Sound and Hood
Canal.
3
Professional and Outreach Activities since Fall 2005
Date
Talks / Activities
Oct. 3, 2006
European Green Crab Status in 2006
Oct 3, 2006
Sex Pheromones: A new tool for
controlling a global invader?
Sept. 7, 2006
Assisted Oregon Public Broadcasting
crew film green crab story for Oregon
Field Guide.
Growth and Persistence of the European
Green crab in Pacific Northwest
estuaries. Guest lecture and field trip for
Aquatic Biological Invasions (Bi 421/521)
Native American use of Shellfish.
Presentation and trapping exercise for
Making a Living in the Estuary (Anthro 407)
Worked with three Marine Biology (Bi
450) students testing responses of male
green crabs to female pheromone
Trapped for green crabs with Fisheries
and Oceans, Canada biologists
Green Crab Biology and Invasion
History. Presentation for Marine Biology
Class (Bi 450)
Trapping demonstration for participants
of Green Crab Technical Meeting
Green Crab Species Overview and Status
in the Pacific NW.
July 18-19, 2006
July 8-9 2006
May 22- June 6
May 14-16
April 10, 2006
Dec. 14, 2005
Dec. 13, 2005
Dec. 6, 2005
Green crab Species Overview and Status
in the Pacific NW.
Nov. 8, 2005
Persistence of the European green crab
in the Pacific NW.
Oct. 5, 2005
Persistence of the European green crab
in the Pacific NW.
Sept. 27, 2005
European Green Crab Status in 2005
Location
Pacific Coast Shellfish Growers
Association/National Shellfish
Association.
Hilton Conference Center
Vancouver, Washington
Tillamook Bay and Netarts Bay,
Oregon
Hatfield Marine Science Center,
Newport, Oregon
Hatfield Marine Science Center,
Newport, Oregon
Yaquina Bay, and Netarts Bay,
Oregon
Barkley Sound, British Columbia
Hatfield Marine Science Center,
Newport, Oregon
Sally’s Bend and Hatfield Marine
Science Center, Newport, Oregon
Green Crab Technical Meeting
Pacific States Marine Fisheries
Commission
Portland, Oregon
Menge-Lubchenco Lab Lunch
Oregon State University,
Corvallis, Oregon
th
100 Meridian- Columbia River
Basin Group.
Portland, Oregon
Oregon Invasive Species Council talk and field trip to retrieve trapped
crabs .
Tillamook, Oregon
Pacific Coast Shellfish Growers
Association/National Shellfish
Association Conference
Hood River, Oregon
4
Introduction
European green crabs (Carcinus maenas) were first discovered on the east coast of North
America in the early 1800’s (Say 1817). These natives of Europe and Northern Africa and were
introduced into North America via shipping. Green crabs arrived in California prior to 1990, and
by 2000, had dispersed as far north as Port Eliza on the northern coast of Vancouver Island,
British Columbia. The potential range of green crab includes Southeast Alaska (Behrens
Yamada 2001, Carlton 2003).
The green crab is a voracious predator that feeds on many types of organisms, including
commercially valuable bivalve mollusks (e.g., clams, oysters, and mussels), polychaetes, and
small crustaceans (Cohen et al. 1995). It also competes with native juvenile Dungeness crabs
and shore crabs for food and shelter (McDonald et al. 2001, Jensen et al. 2002). One native
species, the red rock crab, has been shown to offer biotic resistance to this invader, but only in
the cooler and more saline lower parts of estuaries (Hunt and Behrens Yamada 2003).
Scientists, managers and shellfish growers are concerned that increases in the abundance and
distribution of this efficient predator and competitor could permanently alter native communities
and threaten commercial species such as juvenile Dungeness crab, juvenile flatfish and bivalves
(Lafferty and Kuris 1996, Jamieson et al. 1998).
On the West Coast, the northward range expansion of green crabs during the 1990’s appears to
be linked to favorable ocean conditions for larval transport during El Niño events (Behrens
Yamada et al. 2005). Warm temperatures and strong northward moving coastal currents (>50
km/day) during the 1997/1998 El Niño were correlated with the appearance of a strong cohort of
young green crabs in NW estuaries in the summer of 1998 (Behrens Yamada and Hunt 2000,
Behrens Yamada et al. 2005). With the loss of this strong cohort to senescence and the absence
of favorable currents to transport larvae from California in recent years, it was hoped that green
crabs in Northwest estuaries would go extinct. This has not happened. Some localized
recruitment has occurred in some estuaries every year. Following the warm winters of 2003 and
2005, good green crab recruitment occurred in estuaries from Coos Bay to Kyuquot Sound, BC
on the northern west coast of Vancouver Island.
Goals
The goal of this study is to document the present and predict the future status of the European
green crab in the Pacific Northwest. This is accomplished by:


Estimating the size/age structure and relative density of green crabs in Oregon and
Washington estuaries by using baited traps.
Estimating year-class strength of young-of-the-year green crabs at the end of their first
growing season by setting minnow and pit-fall traps in the high intertidal zone.
5


Comparing patterns in recruitment strength over time and correlating them to ocean
conditions and winter surface temperatures of estuaries.
Collaborating with scientists from Oregon Department of Fish and Wildlife, Washington
Department of Fish and Wildlife and Fisheries and Oceans Canada as well as with
shellfish growers in order to compile all existing green crab data for the Pacific
Northwest.
Figure 1. Map showing the major 6 study sites in Oregon and Washington.
Sampling Methods for Green Crabs
Our sampling effort in 2006 focused on four Oregon and two Washington estuaries: Coos,
Yaquina, Netarts, Tillamook, Willapa Bay and Grays Harbor (Figure 1). These estuaries were
sampled at least three times during the 2005-trapping season (Appendix 2). In each estuary, we
selected study sites within various habitat types and tidal levels. Since green crabs are rare and
patchily distributed, we did not choose our sites randomly. Instead, we preferentially sampled
sites that have harbored green crabs in the past such as tidal marshes, gradually sloping mudflats
and tidal channels where salinities remain above 15 ‰ and water temperatures range between
6
12o-22o C in the summer (Behrens Yamada and Davidson 2002). Green crabs are noticeably
absent from the cooler, more saline mouths of estuaries, which are dominated by the larger and
more aggressive red rock crab, Cancer productus (Hunt and Behrens Yamada 2003).
Since C. maenas larvae settle high on the shore (Zeng et al. 1999), and crabs move into deeper
water as they age (Crothers 1968), we adapted our collecting methods and locations to
effectively sample all age classes of C. maenas. Since traps differ in their sampling efficiency
for different sizes of crabs, we used three trap types (Table 1). Folding fish traps, with their
wide slit-like openings, work well for adult crabs larger than 40 mm carapace width (CW);
while minnow traps with their small mesh size (0.5 cm) retain young-of–the-year green crabs.
Green crabs start entering these baited traps when they are around 20-30 mm CW. Pitfall traps
are water-filled 5-gallon buckets buried into the sediment so that their rims are flush with the
surface of the sediment. Thus they trap actively foraging crabs of any size. Pitfall traps were
only used at the Stackpole site in Willapa Bay where green crabs have been continually sampled
since 1998. Typically, we would trap young-of–the-year green crabs in the high intertidal with
minnow and pit fall traps and larger adult crabs in the mid to low intertidal and subtidal zones
with folding fish traps (Appendix 2).
Table 1. Types of traps used for sampling C. maenas in Oregon and Washington estuaries.
Size selectivity is given in carapace width (CW).
Trap Type
Description
Dimensions
Tidal
Height
Folding
Fukui
Fish Trap
Minnow/
Crayfish
Plastic mesh (2 cm) with two
slit openings (45 cm)
63 x 46 x 23 cm
Wire mesh (0.5 cm) cylinder
with two openings expanded
to 5 cm
Water-filled 5-gallon bucket
embedded into the sediment
21 cm diameter
37 cm long
Subtidal
to lower
intertidal
Medium
to high
Pit fall
31 cm diameter
37 cm high
High
Size
Selectivity
(CW)
Large
>40 mm
Mediumlarge
20-70 mm
All sizes
On gravel shores, we added rocks to the minnow and fish traps to weigh them down and to
provide shelter for the crabs. On soft sediment, we pinned the minnow traps down with thin
metal stakes. We cut fish carcasses into sections and placed them into egg-shaped commercial
bait containers (15 x 8 mm). Holes (0.5 cm) in the sides and lids of the containers allow bait
odors to diffuse. One bait container with fresh bait was placed in a trap and left for one tidal
cycle (typically 24 hours). We retrieved the traps at low tide, identified all crabs and other bycatch to species and noted the sex, carapace widths (CW) and molt stage of all green crabs
(Appendix 3). Green crabs were measured between the tips of their fifth anterio-lateral spines
using digital calipers. Native crabs and other by-catch were released while green crabs were
removed from the ecosystem and destroyed.
.
7
Table 2. Relative Green Crab abundances (# per 100 trap-days) for study sites in Oregon
and Washington estuaries. Data for Grays Harbor 2002 and Willapa Bay 2002-2003 were
kindly supplied by Washington Department of Fish and Wildlife and those for Willapa
Bay 2004, by P. Sean McDonald. Note that in the last four years, green crabs have been
most abundant in Netarts Bay, Oregon.
Estuary
Coos Bay
Yaquina
Netarts
Tillamook
Willapa
Grays
Harbor
Total
Number of crabs trapped divided by (# trap-days)
2002
2003
2004
2005
2006
9
(180)
26
(168)
0
(44)
2
(71)
57
( 1640)
5
(1203)
99
(3306)
Estuary
Coos Bay
Yaquina
Netarts
Tillamook
Willapa
Grays Harbor
Total
2002
5
15
0
3
3.5
0.4
3
14
(203)
63
(1084)
11
(44)
6
(70)
13
(409)
--
18
(137)
12
(461)
12
(39)
4
(51)
6
(195)
--
9
(242)
39
(290)
52
(106)
12
(102)
113
(449)
2
(94)
228
(1283)
22
(273)
48
(211)
47
(82)
41
(147)
19
(245)
3
(175)
180
(1133)
107
(1810)
52
(883)
Catch per 100 trap-days
2003
2004
2005
7
13
4
6
3
13
25
31
49
9
8
11
3
3
25
--2
6
6
18
2006
8
23
57
28
8
2
16
8
Table 3. Green crab annual catch and sighting data for estuaries and inlets in the Pacific
Northwest. Note that catches in Oregon and Washington were high in 1998, right after the
1997/98 El Nino. The last colonists that had arrived during that event died of old-age in the
summer of 2004. However, local recruitment in recent years (especially in 2003, 2005 and
2006) was high enough to keep the Oregon and Washington population of green crabs
from going extinct. Asterisk indicates that fewer than 50 traps were deployed. “P”
indicates that green crabs were present.
Bruce Kauffman of Washington Department of Fish and Wildlife helped calculate catch data for
Willapa Bay and Grays Harbor from 1998 to 2003. Data for the west coast of Vancouver
Island were kindly provided by Fisheries and Oceans Canada scientists (Gillespie et al. 2006).
Additional catch and sighting data were provided Hauck 2000 and Hunt and Behrens Yamada
2000 and by individuals including Neil Richmond, Erin Richmond, John Schafer, Todd Miller,
Chris Hunt, Ron Figlar-Barnes, Marsha Becklund, Ashlie Gilmore, Tim Davidson, TJ Hesse,
John Faudkar, Jessie Hayes, Erik Hanson and Sean McDonald,
Number of Green Crab per 100 trap-days
Estuary/ Site
1997
1998
1999
2000
2001
Kyuquot Sound, BC
2002
2003
2004
P
Esperanza Inlet BC
P
P
P
2005
2006
P
53
5
46
Nootka Sound BC
P
3
Clayoqout Sound. BC
P
20
Barkley Sound. BC
P
Esquimalt BC
P
P
172
2
2
Grays Hbr, WA
28
3
3
1
0.4
Willapa, WA
35
43
4
3
3.5
3
3
25
8
P
P
2*
3
9
8
11
28
6*
0
25
31
49
57
57
15
6
3
13
23
P
P
5
7
13
4
8
Tillamook, OR
P
128
Netarts, OR
P
139
Yaquina, OR
P
192
Alsea Bay, OR
P
Winchester Bay OR
P
Coos Bay, OR
Coquille, OR
0.2
65
P
69
38
63
P
63*
5*
9
Results
Densities in Pacific Northwest
The relative abundances of green crabs trapped in Oregon and Washington estuaries in 2006 are
tabulated in Appendix 2 and summarized in Tables 2 and 3. As can be seen from Appendix 2,
catch per unit effort (CPUE) is extremely variable. Many factors contribute to this variability,
including water temperature, bait type, trap type, tide level, phase in the tidal cycle and the
patchy distribution pattern, molt phase, and hunger level of the crabs. Sampling bias also plays a
role. For example, when green crabs were rare in Oregon, we focused on known “hot spots” to
at least catch a few crabs for age class analysis. One thus must use caution in interpreting
differences in CPUE between sites and over time.
Minor differences in CPUE are not
significant but difference on an order of magnitude would be.
What can be concluded, however, is that catches in Oregon have decreased an order of
magnitude since 1998 colonization event (Table 3). While average CPUE per 100 traps ranged
from 65 to 192 in 1998, it dropped to 0-15 by 2002. Average catches in both Oregon and
Washington averaged less than 7 crabs per 100 traps for 2002, 2003 and 2004. Averages catches
in the last two years have roughly doubled due to good recruitment in 2005 and 2006.
The most interesting development this year has been the extensive sampling program for nonnative species around Vancouver Island by Fisheries and Oceans Canada. (Gillespie et al. 2006).
While no green crabs were trapped in the 19 stations in the inland sea (Johnstone Strait,
Desolation Sound and Discovery Passage), all 5 inlets sampled on the west coast of Vancouver
Island yielded green crabs (Table 3). Densities were comparable, to those measured in Oregon
and Washington over the last two years. However, catches in Barkley Sound averaged 172 per
100 traps, with one station, Pipestem Inlet yielding 228. These densities are as high as those
measured in Oregon right after the 1997/98 El Niño (Table 3)
Recruitment
Sampling of young crabs in four Oregon estuaries since 2002 and at Stackpole in Willapa Bay,
by the Washington Department of Fish and Wildlife and Andrea Randall since 1998, indicates
that recruitment occurred in NW estuaries most years (Figure 2; Appendix 4). We define
recruitment as the time when a new cohort of green crabs first enters our traps in late summer.
Recruitment densities and sizes were measured around September, at the end of their growing
season. The new cohort of green crabs following the 1997/1998 El Niño ranged in abundance
from 0.74 crabs to 5.0 crabs per trap-day and ranged in carapace width from 32-60 mm in
September 1998. In subsequent years catches of recruits decreased by an order of magnitude
(Figure 2; Appendix 4).
Mild winters in Maine and Europe are typically followed by good green crab recruitment and
growth (Berrill 1982, Beukema 1991). This trend also appears to hold for the Pacific Northwest.
The cold winter of 2002 was followed by no recruitment in Washington and only one recruit
being found in Oregon. The mild winters of 2003 and 2005 saw good recruitment in Oregon,
Washington and British Columbia (Figure 2; Appendix 4; Gillespie et al. 2006).
10
Figure 2. Recruitment strength of young-of-the-year green crabs in four Oregon estuaries
and in Willapa Bay, Washington. Willapa Bay was not sampled in 2004. For average sizes
of recruits, see Appendix 4.
100
Recruits per 100 Traps
90
80
Coos
70
Yaquina
60
Netarts
50
Tillamook
40
30
20
10
0
2002
2003
2004
2005
2006
120
Willapa Pit traps
100
Willapa Minnow Traps
80
60
40
20
0
19
98
19
99
20
00
20
01
20
02
20
03
20
04
20
05
20
06
Recruits per 100 Traps
140
11
Since green crabs live up to 6 years, one good recruitment event is needed at least once every 5
years to keep the population from going extinct. When the last crabs of the 98-cohort died of
senescence in the summer of 2004, the 2003 year class became the dominant one in Oregon and
Washington estuaries. Even though the 2003 cohort was less abundant than the 1998 one, it
produced enough larvae in 2005 to adequately “seed” Pacific Northwest estuaries and keep the
Oregon and Washington population from going extinct. In Willapa Bay, the 2005 recruitment
event was the strongest since 1998 (Figure 2; Appendix 4). While recruitment in Oregon
estuaries was good in 2006, Washington estuaries showed a decline. The loss of nursery habitat
in Willapa Bay due to the Spartina eradication program may have contributed to low
recruitment.
Age Structure of Green Crabs in Oregon and Washington Estuaries
From previous mark and recapture studies and from shifts in size frequency distributions over
time (Behrens Yamada et al. 2005,) we estimated the age of green crabs retrieved from Oregon
and Washington estuaries in 2006. We assigned crabs to age classes based on their size and
coloration (Table 4; Appendix 3). For example, during the summer crabs between 50 and 70
mm, with green or yellow carapaces would represent the 2005 year class. Larger crabs, most
likely belonged to the 2003 year class as recruitment was poor in 2002 and 2004. Over 80% of
the green crabs in Oregon and Washington estuaries belong to the 2005 and 2006 year classes.
These young crabs comprise the majority of the breeding population, and would be able to seed
Oregon and Washington estuaries until 2012.
Table 4. Estimated age structure of Carcinus maenas retrieved from Oregon and
Washington estuaries in the 2006. Total crabs include trapped crabs recorded in Table 1,
those caught in pheromone trials, crabs and molts found on the shore and in sports
catches. “P” indicates that the 2004 year class was represented in Yaquina Bay in
previous years, but could not be distinguished from the 2003 cohort.
Estuary
Coos Bay
Yaquina
Netarts
Tillamook
Willapa
Grays Harbor
Total
2006
18
18
26
35
6
1
104
Year Class
2005
2004
1
18
P
30
9
25
1
84
2003
5
29
3
2
1
40
Total
24
65
59
46
32
2
228
12
Conclusions
In 2006, we found green crabs, including 2006 recruits, in all six Oregon and Washington
estuaries. Catches were highest for Netarts (65/100 traps) at the center, and lowest for Grays
Harbor and Coos Bay, toward the edge of the range sampled. Recruitment in Oregon estuaries
was good in 2006 (between 20 and 65 per 100 traps) but much poorer in Willapa and Grays
Harbor. The 2005 and 2006 cohorts are now the dominant year classes in Oregon and
Washington estuaries, comprising 82% of the population. Given that the longevity of green
crabs is 6 years; these strong cohorts will provide a larval source until 2012. From 2002 to 2004
green crab catches in Oregon and Washington averaged less than 7 crabs per 100 traps. This
population density appears to be large enough to keep the population from going extinct. These
observations together with the recent confirmation of viable green crab populations on the west
coast of Vancouver Island suggest that this species is very likely to persist in the Pacific
Northwest.
Even though green crab abundance in the Pacific Northwest is below a level at which ecological
impact can be measured (10 per trap; Grosholtz, personal communication) and much lower than
in Europe, eastern North America, Tasmania and California, it is imperative to continue
monitoring efforts for two reasons:
3) to elucidate the process of range expansion and population persistence of this model nonindigenous marine species with planktonic larvae and
4) to understand the role of ocean conditions on recruitment strength in order to predict the
next strong recruitment event of green crabs.
Outreach efforts to educate the general public, including boaters and shellfish growers, not to
transport non-native Aquatic Nuisance Species (ANS) from one area to another should continue.
Such efforts could delay the spread of ANS in general, and could prevent the establishment of
the green crab in the inland sea between Vancouver Island and the mainland, including Puget
Sound and Hood Canal. Once green crabs get established in the inland sea, they would spread
very quickly as many suitable habitats, devoid of larger crabs and other predators, exist in
shallow, warm bays and near freshwater outfall. Other non-native species such as the Japanese
oyster, the manila clam and the purple varnish clam spread throughout the inland sea in couple
of decades as larvae are retained and not carried out to sea as may be the case the coastal
estuaries of Oregon and Washington.
Acknowledgements
We thank Jonathan Leischner, Lindsay Gibbs and Catherine DeRivera for trapping help in
Oregon estuaries. We are grateful to Harry and Annette’s Seafood for continually supplying us
with fresh bait, and to the staff of North Bend Airport Security for allowing us to sample at
13
Pony Point. Bruce Kauffman of Washington Department of Fish and Wildlife and Scott Groth
of Oregon Department of Fish and Wildlife provided additional data. We thank the staff and
faculty of the Oregon Institute of Marine Biology for their hospitality while sampling in Coos
Bay. We are especially thankful for Graham Gillespie, Tom Therriault, Antan Phillips, Dennis
Rutherford, Debbie Paltzat, Susan Bower and Jason Dunham of Fisheries and Oceans Canada
for sharing their data on the recent non-native species survey around Vancouver Island.
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2005. Growth and persistence of a recent invader Carcinus maenas in estuaries of the
Northeastern Pacific. Biological Invasions 7:309-321
Behrens Yamada, S. 2001. Global Invader: The European Green Crab. 123 pages.
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Behrens Yamada, S. and C. Hunt 2000. The arrival and spread of the European green
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Crothers, J.H. 1968. The biology of the shore crab Carcinus maenas (L.). 2. The life of the adult
crab. Field Studies 2:597-614.
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Hauck, L. 2000. Use of tethered prey for estimating the impact of the invasive European green
crab. BS thesis, Biology Department, Oregon State University.
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14
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15
Appendix 1. Physical data for Carcinus maenas sampling sites in Oregon and Washington estuaries. Range of values observed
includes sampling times from 2002 to 2005.
Green
Site
Date
Location Description
S ‰ Water
Air
Temp. Temp. Crabs
Found?
COOS BAY
Jordan Cove
Range of values observed
4/4/06
5/16/06
5/17/06
9/10/06
9/11/06
Russell Point
Range of values observed
4/4/06
5/16/06
5/17/06
5/18/06
6/28/06
6/29/06
Trans Pacific Br. 9/13/06
N 43o 26.222’
W 124o 14.155’
Trans Pacific Ln.
6/7/06
N 43o 26.571’
o
W 124 13.388’
9/13/06
Haynes Inlet
N 43o 27.003’
W 124o 13.478’
9/13/06
Range of values observed
5-34
20
29
28
34
32
14-22
22-33
20
27
28
29
27
27
11-20 10.5-28
10.5
9.5
14.9
15
14.8
16.7
15.5
14.5
14.4
19.4
17
14-24
14.5
23.5
17
32
17
16.4
22-33
26
33
11-18
10.5-16
18.6
16.4
15
15.3
no
no
no
yes
yes
no
no
no
no
no
no
yes
no
no
yes
16
Glasgow
N 43o 26.941’
W 124o 19.476’
9/13/06
Kentuck inlet A
N 43o 25.299’
W 124o 11.522’
9/13/06
28
19.1
19
yes
Kentuck Inlet B
N 43o 25.201’
W 124o 13.229’
9/13/06
28
19.1
19
no
Chaleston,
Metcalf Marsh
9/13/06
34
12.7
14.8
no
Charleston Boat
Basin
6/7/06
30
17.7
19.3
no
Pony Point
N. Bend Airport
N 43o 25.403’
W 124o 14.369’
Ferry Road Park
N 43o 25.185’
W 124o 13.0851’
no
6/10/06
7/5/06
9/11/06
7/4.06
28
18
17.6
no
23-32
10
30
15-20
13.4
21.5
16-22
13.2
19.8
no
yes
YAQUINA BAY
Johnson Slough
N 44o 34.692’
4/25/06
W123o 59.333’
8/23/06
Range of values observed
Mudflat near rip rap, Zostera marina
11-17 11.5-18
11.0
10.8
15
14.2
18.7
17.7
18.2
17
17-32
20
24
27
33
4/4/06
Range of values observed
Below bridge/along creek bank , Salicornia patches
yes
no
no
yes
17
30
14.7
17.2
yes
22-33
20
12-26
13.3
no
33
31
32
12-19
14.9
15.9
17.2
18
16.8
22.3
20
15
no
yes
yes
29-33
33
31
32
12-19
17.2
18
16.8
12-24
22.3
20
15
yes
yes
yes
32
16.8
17
yes
19-32
21
26
31
10-19
14.9
15.9
21
9-22
13.6
16.5
19.0
no
no
yes
Range of values observed
Rip rap/ boulders/sandy mudflat/ Zostera marina
22-34 11-21.5 12-23
32
15.3
16.5
30
16.5
22.3
34
16.8
21
yes
yes
yes
Range of values observed
Tidal channel draining mudflat, along nature trail
19-34
24-27
32
yes
no
9/26/06
Sally’s Bend A
N 44o 37.699’
W124o 01.482’
Sally’s Bend B
N 44o 37.640’
W124o 00.790’
Sally’s Bend D
N 44o 37.561’
W124o 00.537’
Sally’s Bend C
N 44o 37.419’
W124o 01.463’
4/28/06
6/14/06
8/16/06
8/23/06
9/20/06
8/16/06
8/23/06
9/20/06
Range of values observed
Scirpus patches
Range of values observed
Scirpus patches
Scirpus patches
9/21/06
4/28/06
Range of values observed
Eel grass from gate to Fishing platform
6/14/06
6/23/06
Hatfield Marine
Science Center
Pump house
N 44o 37.408’
W124o 02.576’
Oregon Coast
Aquarium
N 44o 37.108’
6/14/06
7/9/06
7/18/06
4/28/06
8/16/06
9-25
15
18.5
8-23
16.5
22.5
18
W124o 02.165’
Idaho Point
N 44o 36.818’
W 124o 01.582’
Neohla Pt.
N 44o 36.751’
W 124o 02.517’
9/19/06
Range of values observed
6/15/06
6/15/06
no
19-35 12-27.5 12-23
30
16.7
17.8
yes
16
yes
14
yes
Tidal reek near Spencer care center on Idaho Pt.
Road
9/19/06
TILLAMOOK BAY
Tillamook Spit A
4/25/06
N 45o 30.843’
o
W 123 56.738’
7/27/06
Tillamook Spit B
N 45o 30.456’
W 123o 56.615’
14
Range of values observed
mudflat- eelgrass zone below rip rap and in Scirpus
9/06/06
0-30
11
30
31
13-19
12.7
21.0
18
13-27
17.4
18.6
19.2
yes
yes
yes
7/26/06
9/06/06
30
31
21.5
18
16.5
19.2
no
yes
Pitcher Point
N 45o 30.365’
W 123o 56.508’
9/06/06
South of Spit B – mudflat in Japanese eelgrass zone
31
18
19.2
yes
Hayes Oyster
N 45o 29.445’
W 123o 55.010’
7/26/06
9/05/06
Mudflat in native eelgrass zone
High zone in Carex vegetation
8
26
21.0
15.9
20.1
14.3
no
no
Old Mill Marina
7/26/06
34
13.8
29.8
no
NETARTS BAY
19
Boat Ramp
N 45o 25.832’
W 123o 56.827’
9/7/06
Low to mid-tidal rocks and mud flat
34
14.4
18
yes
Whiskey Creek
Salmon hatchery
o
N 45 24.-----’
W 123o 56.-----‘
4/25/06
7/26/06
9/06/06
Intersection of
Whiskey Creek
& Netarts Bay
Roads
N 45o 24.865’
W 123o 56.064’
WILLAPA BAY
Stackpole
Leadbetter Pt.
Sate Park
N 46o 35.848’
W 124o 02.195’
4/25/06
7/26/06
9/06/06
4/1/06
4/17/06
4/28/06
5/16/06
5/31/06
5/31/06
7/25/06
9/06/06
Range of values observed
On mudflat and in creek
34
31
Range of values observed
Pool below culvert draining Freshwater marsh
0-34
33
32
34
Range of Values observed
Shellbags onTide flats outside spartina field
Shellbags
Shellbags
Shellbags
Shellbags
Pit traps in Spartina field
Pitfall traps
10/24/06
Parcel A
7/13/06
0-34
Edge of Spartina
13-20 14.5-21
13.7
21.0
22.0
17
16
13.5-20 15s-23
13.7
19.4
16.5
17.5
18.8
18
14-28
11-19
9-28
23
23
23
23
26
25
30
32
30
11
11
13
19
20
16
10
9
11
18
16
18
No
yes
yes
yes
yes
yes
yes
15
12
15
10
yes
yes
yes
no
no
yes
yes
yes
yes
Data
taken
no
Thermometer broke
20
Taylor Resources
7/11/06
Bay Ave./Sandridge Rd, edge of Spartina field
25
18.8
17.5
yes
Boat Ramp by
Refuge
N 46o 24.750’
W 123o 54.258’
7/12/06
Mile 24, Highway 101. Either side of boat ramp used
by old cable ferry
21
19.7
15.4
no
Pickerrell Creek
N 46o 32.930
W 123o 53.765’
7/12/06
Mile 37.5, Highway 101. Near channel and on mudflat
1
15.3
15
no
Bay Center
N 46o 37.782’
W 123o 57.562’
7/12/06
Spartina patches on sand flat
30
21.9
18.7
no
Private wildlife sanctuary, in front of Grassy Island
Upper tideland
30
24
30
25
21
16
14
11
26
16
13
9
no
no
yes
no
o
N 46 29.519’
W 124o 01.814’
GRAYS HARBOR
6/26/06
Lila St. Refuge
7/13/06
N 46o 52.480’
o
W 124 05.904’
9/22.06
10/26/06
Brady’s Oysters
N 46o 51.723’
W 124o 04.333’
6/26/06
7/13/06
9/22/06
10/26/06
Mouth of Elk River
25
24
28
26
20
16.7
13
10
24
16.7
14
9
no
no
no
yes
Bay View Road
9/22/06
Upper tideland, native vegetation
25
14
13
no
21
Appendix 2. Relative abundance of crab species and sculpins (Numbers/trap/day) in Oregon and Washington estuaries during
2006. An asterisk beside trap number indicates that other traps were either opened or were stolen.
Coos Bay
Site
Russell Point
4/4/06
4/5/06
5/16/06
5/17/06
5/18/06
6/28/06
6/29/06
6/29/06
Cancer
magister
0.5
1.82
5.67
5.5
11.33
11.33
7.1
10
0
0
0
0
0
0
0
0
0.2
0.3
4.63
1.2
5.5
0.4
0.1
0
0.1
0.2
0
0
0
0
0
0.4
0.1
2.4
0
1.1
Pony Point/Airport 4/4/06 Fish
6/8/06 Fish
7/5/06 Fish
9/12/06 Fish
Ferry Road
Cancer
Cancer
magister
productus
(Recruits)
Trap
Carcinus Hemigrapsus Hemigrapsus
Zone
maenas oregonensis
nudus
Type
Fish Pools by bridge
Fish Zoster marina
Fish
Fish
Fish
Fish
Fish
Pools
Fish
4/4/06
6/8/06
7/5/06
9/12/06
Minnow
7/5/06
Fish
Zostera marina
0
0.3
0
0
0.1
minnow
Minnow
Minnow
Haynes Inlet
9/13/06 Minnow
Glasgow
9/13/06 Minnow
Kentuck A
9/13/06 Minnow
0.2
0.2
0.5
0.6
0.4
0.17
0.17
0.1
0.33
0.2
0.5
1.17
0.67
1
0.1
0.25
0
0.09
0.6
0.4
0
Number
Traps
6
6
6
6
6
6
10
4
0.3
0.7
10
11
10
10
10
10
10
10
1.2
10
0
0.25
4
0
0.4
5
0
0
Sculpin
5
22
Kentuck B
Charleston Boat
Basin
Medcalf Marsh
9/13/06 Minnow
6/8/06
Fish
0
9/13/06 Minnow
Trans-Pacific Ln. 6/8/06 Fish
9/13/06 Fish
6/8/06 Minnow
9/13/06 Minnow
Trans Pacific Br. 9/13/06
Jordan Cove
Zostera marina
0.4
Scirpus
Johnson Slough
0.2
5
0.6
0
0.3
10
0
0
0
5
4.9
0.2
0.7
0
0
0
2.6
0.2
2.3
10
5
10
0
0.2
5
1.1
0.4
0.5
0.75
10
10
10
8
10
20
0.2
Scirpus
0
0
Scirpus
0
0.1
0.75
0.9
0.2
0
0
0
0
0
0
0
0
0.2
Mean CPUE (Catch/trap/day)
Yaquina Bay
Site
0
0
Low
Minnow
04/04/06 minnow
04/5/06 Minnow
5/16/06 Minnow
5/17/06 Minnow
9/11/06 Minnow
9/12/06 Minnow
0
0.6
Date
Trap
Type
4/28/06 Fish
8/24/06 Fish
9/26/06 Fish
4/28/06 Minnow
8/24/06 Minnow
9/26/06 Minnow
Zone
Carcinus Hemigrapsus
maenas oregonensis
Hemigrapsus
nudus
Cancer
magister
1.67
7.0
3.5
3.5
0.33
Below Bridge
0.5
1.25
Marsh
0.07
Cancer
Cancer
magister productus
(Recruits)
0.5
0
0
0
0
0
Sculpins
Number
Traps
0.5
0.5
1.0
0.67
1.0
0.53
2
2
4
3
8
15
23
Sally’s Bend A
04/28/06 Minnow
6/15/06 Minnow
Scirpus
8/17/06 Minnow
8/24/06 Minnow
9/20/06 Minnow
Sally’s Bend B
8/17/06 Minnow
8/24/06 Minnow
9/20/06 Minnow
Scipus
Sally’s Bend C
04/28/06 Fish Zostera marina
Fishing Platform
6/15/06 Fish
6/23/06 Fish
Sally’s Bend D 9/21/06 Minnow
Scirpus
HMSC Pump
house
6/15/06 Fish
Zostera marina
6/16/06 Fish
7/9/06 Fish
7/18/06 Fish
Oregon Coast
Aquarium
4/28/06
Fish
4/28/06 Minnow
subtidal
0.1
0.2
0.33
0.5
0.17
0.67
1.5
0.33
0.2
0.2
1.0
0.75
0.17
0
0
0
0
0
0
0
0
1.0
0
0.1
0.53
0.8
0.5
0.13
5.4
2.3
0
0
0
0.4
0.1
2.0
0
0.4
0.2
0.33
.2
0.44
0.6
0.4
0.67
0
0
0
0.5
3.5
2
Scirpus
0.6
8/17/06 Minnow
9/20/06 Minnow
Idaho Point
Neohla Point
6/16/06
Fish
Low
6/16.06 Fish Marsh and creek
6/20/06 minnow
1.2
1.0
0.2
1.0
0.2
3.5
0.66
0.1
0.1
0.57
5.1
0.8
0.3
1.0
2.23
0.17
5.5
2
9.8
3.7
1.33
5
10
15
0.9
3.5
10
0.2
0.11
1
7.7
3.55
5
10
9
0.5
1.33
1.5
0
0
0
3
10
9
10
20
6
8
6
2
3
10
10
5
3.75
1.0
4
5
24
Mean CPUE (Catch/trap/day)
Tillamook Bay
Site
Tillamook Spit A 4/26/06
Trap
Type
Fish
Fish
Fish
Fish
7/26-27
9/06/06
9/07/06
4/26/06 Minnow
9/06/06 Minnow
9/07/06 Minnow
Zone
Scirpus
Carcinus Hemigrapsus
maenas oregonensis
0.125
0.33
0.82
0.73
Scirpus
0.4
0.07
Hemigrapsus
nudus
4.83
Cancer
magister
0.25
1.0
1.0
0.125
0.8
0.33
0.07
Tillamook Spit B 4/25/06
Fish Zostera japonica
Pitcher Point
Hayes Oysters
Minnow
0.8
Minnow
Minnow
Scirpus
Minnow
Fish
Minnow
Bay City/Old Mill 7/26/06 Fish
0.5
0.2
0.7
0.2
2
Low, eelgrass
High vegetation
0.52
Subtidal/docks
8
Netarts Bay
Site
0.3
Scirpus
Minnow
0
0
1.0
0.18
0
0.2
0.93
0.08
0.125
3.83
1.35
1.17
0.25
1.8
1.43
0
7/26-27 Fish
4/25/06
9/06/06
9/07/06
9/06/06
9/07/07
7/26/06
9/6/06
Cancer
Number
Cancer
magister
productus Sculpin
Traps
(Recruits)
9.7
8
12
11
11
8
5
15
1
4.7
10
0
1.0
4.5
0
0.1
0.01
0.1
0.9
0.4
1.4
3.4
0.14
2.7
6
10
10
10
10
10
10
0
11.75
4
Mean CPUE (Catch/trap/day)
Trap
Type
Zone
Carcinus Hemigrapsus
maenas oregonensis
Hemigrapsus
nudus
Cancer
magister
Cancer
Number
Cancer
magister
productus Sculpin
Traps
(Recruits)
25
Boat Ramp
Intersection
9/07/06 Fish
04/26/06
06/26/06
9/06/06
9/07/06
Fish
Fish
Fish
Fish
Whiskey Creek
04.26/06 Fish
Salmon Hatchery
07/26/06 Fish
9/06/06 Fish
9/07/06 Fish
04/26/06
07/26/06
07/27/06
9/06/06
9/07/06
Minnow
pools
Fucus/mudflat
Fucus/mudflat
Minnow
Minnow Zeroed in on hotspot
Minnow
Minnow
0.2
2.67
0.25
0.75
0.75
0.4
1
0.5
0.67
1.0
0.5
1.5
0.5
0.08
0.2
0.6
0.8
0.5
0.75
3.77
0.5
0.33
2.4
1.8
0.2
0.2
Willapa Bay
0
0
0
0
0
1.0
1.2
0.25
4
6.5
1.75
0
0.5
0.75
0.75
0.33
1.3
0.1
0.2
0.1
5
3
4
4
4
3
0
0
0.25
0
0
0
0
0
0.25
0.75
1.5
0.6
1.0
0.1
4
4
4
12
10
5
10
10
Mean CPUE (Catch/trap/day)
Trap
Type
Zone
5/31/06
6/1/06
Pit-fall
Spartina
7/25/06
7/26/06
7/27/06
9/06/06
9/07/06
10/24/06
Pit-fall
Site
Stackpole
0.25
8.8
3.33
0.77
8.0
4
Pit-fall
Carcinus Hemigrapsus
maenas oregonensis
0.12
0.06
Pit-fall
0.6
Pit-fall
Pit-fall
Pit-fall
Pit-fall
5/31/06 Minnow
6/1/06 Minnow
7/27/06 Minnow
9/06/06 Minnow
9/07/06 minnow
*one trap lost lid for>30 d
0.12
0.06*
0.1
0
0.1
0.1
0.88
1.0
0.7
0.29
0.35
0.12
0.17
0.06*
0.4
0.7
0.4
0.2
0.2
Hemigrapsus
nudus
Cancer
magister
0
0
0.06
0.12
0.12
0.1
0.1
0.6
0.58
2.23*
0
0
0.8
0.2
0.7
Cancer
Number
Cancer
magister productus Sculpin
Traps
(Recruits)
0
0
3.9
8.4
12.2
5.76
7.47
0.29*
0
0
0.2
1.3
0.9
0
0
0
0
0.3
0.7
1.9
1.3
1.5
17
17
17
17
17
17
17
17
10
10
10
10
10
26
0.3
10/24/06 Minnow
0.2
0.5
0
0.3
10
0.6
0
2.8
10
Taylors
Resources
7/12/06 Minnow
Spartina edge
Nacotta Lab
7/13/06 Minnow
Spartina edge
0.3
0
1.5
10
Long Is.Refuge
7/12/06 Fish
Old ferry ramp
17.8
3.5
0
0
1.2
5
5
37.4
2.2
0
0
1.6
0.2
5
5
0.89
0.33
0.33
9
0.2
Minnow
Pickerrell Creek 7/12/06 Fish Along creek bank
Minnow
Bay Center
7/12/06 Minnow
end of School Rd,
in Spartina patches
0.22
Grays Harbor
Mean CPUE (Catch/trap/day)
Trap
Carcinus Hemigrapsus Hemigrapsus
Zone
maenas oregonensis
nudus
Type
Lila Street-refuge 6/26/06 Fish Native vegetation
Site
Cancer
magister
Minnow
7/13/06 Minnow
7/14/06 Minnow
0.06
9/22/06 Minnow
0.06
10/26/06 Minnow
Brady’s Oysters
6/26/06
Fish
7/13/06
Fish
7/14/06
Fish
6/26/06 Minnow
7/13/06 Minnow
Low to mid
Native vegetation
2.4
2.95
3.5
0.2
Cancer
Number
Cancer
magister productus Sculpin
Traps
(Recruits)
0
0.6
5
0
4.9
10
0
0
0
0
0.6
0.3
0.33
0.5
15
20
15
10
0
0.05
0.2
0
0.2
1.3
4.64
1.3
5.2
1.0
5
20
20
10
10
0.7
27
0.1
7/14/06 Minnow
9/22/06 Minnow
0.2
10/26/06 Minnow
Bay View Road
9/22/06 Minnow
Upper tideland
0.5
0
0
0.2
0.4
0.9
1.6
10
10
10
5
28
Appendix 3. Carcinus maenas Catches and Sightings from Oregon and Washington Estuaries in 2006. Year Classes are
estimates based on crab size, carapace coloration, hardness and presence of large barnacles. Crabs that are green have molted
recently, while red crabs have not molted for a long time, in some case well over a year. Missing limbs are numbered in
sequence: 1= Right claw; 5= last leg on right side, 6= left claw, 10=last leg on left side.
Estuary
COOS
Site
Airport /Pony Pt
Date
4/4/06
9/12/06
Jordan Cove
9/10/06
9/11/06
9/12/06
Pooled sites:
Trans Pacific Br.
Hayes, Kentuck A
9/13/06
Boat Basin
North Spit
6/5/06
7/10/06
Sex
M
M
M
M
F
M
M
M
M
M
M
M
F
M
M
M
M
M
M
M
F
M
?
M
CW
83.4
79.0
80.34
86.52
73.16
37.50
42.57
38.78
38.2
44.36
41.57
49.50
44.04
52.2
45.08
45.11
56.34
40.36
36.24
47.47
46.08
46.65
23
40
Color
Yellow green
orange
Orange
Orange
Yellow-green
Green
Yellow-green
Green
Yellow-green
Yellow-green
Yellow-green
Yellow-green
Yellow-green
Yellow-green
Yellow-green
Yellow-green
Yellow
Yellow
Yellow
Yellow
Green
Yellow
Green
Condition/Comments
2003
Good
2003
Good
2003
Large barnacles
2003
No # 6.,4
2003
No # 4
2006
Good
2006
Good
2006
Good
2006
Good
2006
Good
2006
Good
2006
Good
2006
Good
2006
Good
2006
Good
2006
No #2
2005/2006
2006
2006
2006
2006
2006
Scott Groth; Molt; crab is now 30 mm
2006
2006
Scott Growth; good
Year Class
29
YAQUINA
Joe Ney Slough
Hanson Landing
12/6/06
F
88.55
Johnson Creek
8/24/06
9/26/06
Sally’s Bend A
8/24/06
9/20/06
Sally’s Bend B
8/17/06
M
M
M
M
M
M
F
M
M
M
F
M
M
M
M
F
M
M
M
M
M
M
F
M
F
F
M
M
64.4
Yellow
2005
Good, #6 regenerating
73.41
Yellow
2005
No # 1
76.93
Orange
2003
Barnacles on back
92.48 Yellow-orange
2003
No # 8
74.23
Yellow
2005
good
79.27
Yellow
2005
Both claws regenerating
54.70
Green
2005/2006 good
35.92 Yellow-green
2006
Good
35.52
Green
2006
Good
38.06 Yellow-green
2006
Good
35.14
Green
2006
Good
33.84
Green
2006
Good
44.48
Green
2006
Good
40.15
Green
2006
Good
38.72
Green
2006
Good
36.36
Green
2006
Good
48.10 Yellow-green
2006
Good
54.74 Yellow-orange
2005
Good
54.4
Yellow green
2005
No #1, 2, 5 6; cracked carapace
49.6 Orange yellow
2005
Good
51.19
Green
2006
Good
48.13 Yellow-green
2006
Good
44.91 Yellow-green
2006
Good
45.84
Yellow
2006
Good
45.77
Green
2006
Good
47.77 Yellow green
2006
Good
46.08
Yellow
2006
Good
50.99
yellow
2006
Good
73.2
2003
Molt ; crab is now over 80 mm
8/24/06/
Sally’s Bend C
6/23/06
Sally’s Bend D
9/21/06
HMSC Pump
5/30/06
?
2003
Tom Gaskill; Missing 3 legs
30
dock beach
6/14/06
6/15/06
07/08/06
07/18/06
Aquarium mud flat
Idaho Point
07/19/06
4/29/06
6/6/06
6/14/06
6/16/06
6/23/06
7/19/06
7/20/06
9/19/06
M
F
M
M
M
73.6
80.5
91.0
87.9
81.8
Orange
Orange
Orange
Yellow
Yellow orange
2003
2003
2003
2003
2003
M
M
M
M
M
M
M
87.7
89.1
47.9
88
83.8
92
73.8
54.9
62
62.8
89.5
92.0
86.8
76.9
67.0
60.6
89.4
83.6
71.8
84.9
90.4
81.5
89
79.4
61.45
Yellow orange
Yellow
Green
Orange
Orange
Orange
Yellow-orange
Yellow green
Yellow green
Yellow
Yellow
Yellow
Yellow orange
Yellow green
Yellow green
Green
Orange
Yellow
Yellow
Yellow-orange
Yellow-orange
Yellow-orange
Yellow
Yellow-orange
Yellow-orange
2003
2003
2005
2003
2003
2003
2003
2005
2005
2005
2003
2003
2003
2003
2005
2005
2003
2003
2003
2003
2003
2003
2003
2003
2005
M
M
M
M
M
M
M
M
F
M
M
M
M
M
M
M
M
M
good
No # 5; tips on propal tip worn
No # 6, 7, 8, 10
Propal tip on #6 worn
Small barnacles; no # 3; worn
propal tip
8 mm barnacles, no 1, 3, 7
No # 3; dactyl half gone
good
No # 5, 9
No # 3, 7
good
Non 1, 3, 5, 10 no claw on 6
Good
Good
good
Good
Good
No # 1; 10 regenerating
Good
Good
Good
With barnacles/ good
good
good
No # 8
good
No # 1
good
No # 1
No # 1,6,7
31
9/20/06
Neohla Point/
Spencer Point
TILLAMOOK Spit A
9/21/06
06/15/06
M
81.08 Yellow-orange
72.50
Yellow
93.5 Yellow-orange
63.7
Yellow green
9/21/06
M
M
M
M
64.1
Orange
2005
83.55 Yellow orange
2003
58.05
Green
2005
55.41
Yellow
2005/2006
M
M
M
M
M
M
M
M
M
F
M
M
M
M
M
M
M
M
M
M
M
F
48.5
67.7
72.7
63.6
70
65.2
41.8
41.5
41.4
39.8
41.4
81.3
72.5
69.4
66.9
37.1
51.4
58.4
49.3
40.8
42.6
39.7
4/26/06
7/25/06
7/27/06
9/05/06
Spit B
Pitcher Point
Spit/ pooled sites
M
M
M
9/05/06
9/05/06
9/06/06
Yellow orange
Yellow-green
Yellow-orange
Yellow-orange
Yellow
Yellow
Yellow-green
Green
Green
Green
Green
Orange
Yellow-orange
Yellow-orange
Yellow-orange
Green
Yellow-green
Yellow
Yellow-green
Yellow-green
Green
Green
2003
2005
2003
2005
2005
2005
2003
2005
2005
2005
2006
2006
2006
2006
2006
2003
2005
2005
2005
2006
2006
2005
2006
2006
2006
2006
Good
Good
Good; caught by David Trystman
Good; # 6 regenerating
good
Good
Good
Good
Missing # 4, 6, 7, 8, 9
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
# 1 regenerating,; 2, 7 missing
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
32
NETARTS
F
F
M
M
M
M
M
F
F
F
M
M
M
F
F
F
M
F
F
F
?
?
?
?
40.9
37.8
37.2
36.5
43.7
41.8
42.3
41.4
39.1
31.0
34.4
48.23
40.55
44.29
45.46
42.72
34.95
38.73
40.15
33.65
Green
green
Yellow-green
Yellow
Yellow-green
Green
Green
Yellow-green
Green
Green
Yellow
Yellow-green
Green
Green
Green
Green
Yellow-green
Yellow-green
Yellow-green
green
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Escaped
Escaped
Escaped
Escaped
Spit/ pooled sites
9/7/06
Intersection of
Netarts and Whiskey
Creek Roads
4/25/06
M
63
Yellow green
2005
Missing # 2
4/26/06
M
M
M
61
60.3
41.0
Yellow green
Yellow green
Yellow green
2005
2005
2005
Missing 1 and 6
Good
Good
33
5/25/06
5/26/06
07/26/06
07/27/06
9/05/06
9/07/06
Whiskey Creek
Salmon hatchery
4/25/06
4/26/06
5/25/06
5/29/06
7/26/06
7/27/06
9/05/06
M
M
M
M
M
M
M
M
M
F
F
M
M
M
M
M
M
M
54.5
Yellow green
44,6
Yellow green
63.5
Yellow green
82.2
Red orange
55
Yellow orange
49.9
Yellow
72.4
Yellow
61.2
Yellow
57.6
Yellow green
67.9
Green
55.2
Green
61.9
Yellow
61.5
Yellow
69
Yellow-green
68.6 Yellow-orange
66.72
Yellow
70.40 Yellow-orange
56.2
Yellow green
2005
2005
2005
2003
2005
2005
2003
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
Good
Good
Good
Good
Missing # 1, 2, 3, 6
Missing # 1
# 6 regenerating
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
F
M
M
F
M
F
M
M
F
M
F
M
M
45.3
56.8
58.0
36
72.5
53.0
27.2
24.7
26.6
30.4
24.8
65.5
49.6
2005
2005
2005
2005
2005
2005
2006
2006
2006
2006
2006
2005
2006
Missing #1 (right claw)
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Yellow orange
Yellow green
Yellow green
Yellow green
Yellow
Yellow-green
Green
Green
Green
Green
Green
Green
Yellow-green
34
9/06/06
9/07/06
Boat Basin
9/07/06
South end of Bay, Early May
oyster plots
Oyster hatchery
~July 12
~July 12
WILLAPA
Stackpole
4/1/06
4/1/06
4/1/06
4/1/06
4/1/06
4/1/06
M
F
M
M
M
M
F
M
F
F
F
M
F
F
M
M
F
F
M
F
F
F
M
F
F
M
?
F
42.6
47.0
34.4
41.8
39.4
34.0
30.5
38.9
41.4
36.8
37.0
34.2
36.2
38.31
38,27
37.41
47.62
36.19
40
28.64
~65
74.86
M
M
Yellow-green
Yellow-green
Green
Green
Green
Yellow-green
Green
Green
Yellow-green
Green
Yellow-green
Green
Yellow-green
Green
Green
Yellow-green
Yellow-green
Green
Green
Yellow-green
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2006
2005
2003
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
Good
escaped
Carrying eggs, Matt Bunell
74.43 Yellow-green
69.36 Yellow-orange
2005
2005
Good, Mark Witwer
Good, Mark Witwer
49.0
48.0
50.8
47.4
45.1
45.0
2005
2005
2005
2005
2005
2005
Orange
orange
Orange
Orange
Yellow/orange
Orange
Orange
Good
Weggs, Shell bags
Missing 2, shell bags
Missing 3 and 6, shell bags
Good, shell bags
Missing 8, shell bags
35
4/1/06
4/17/06
4/28/06
5/31/06
5/31/06
5/31/06
6/1/06
7/27/06
7/27/06
9/06/06
9/06/06
9/06/06
10/24/06
10/24/06
10/24/06
10/24/06
Stony Pt
April
April
April
April
April
Parcel A, WDFW 5/15/06
5/16/06
Taylor Resources 7/12/06
7/12/06
Bay Cnt. Mariculture
11/07/06
Grays Harb Wildlife Sanctuary
Brady’s Oysters
9/22/06
10/26/06
10/26/06
M
M
M
M
M
M
M
M
M
M
F
M
M
F
F
F
M
F
M
M
M
M
M
M
M
F
44.7
45.5
48.2
57.0
43.2
57.8
50.4
61.4
59.9
61.0
35.4
39.0
45.3
49.0
40.1
46.1
52.0
53.0
44.0
44.0
47.0
63.0
49.0
61.1
65.0
80
M
M
M
60.0
56.5
49.0
orange
orange
Yellow/orange
Green/yellow
Green/yellow
Yellow
Green/yellow
Orange
Orange
Yellow
Green
Green
Yellow
Green
Green-yellow
green
Orange
Orange
Orange
Orange
orange
Yellow
Orange
Yellow-orange
Yellow
orange
Orange
Green
2005
2005
2005
2005
2005
2005
2005
2005
2005
2005
2006
2006
2006
2006
2006
2006
2005
2005
2005
2005
2005
2005
2005
2005
2005
2003
2005
2005
2006
Missing 8, shell bags
Missing 1, shell bags
Good, shell bags
Good, Pit trap
Good, Pit trap
Good, Crayfish trap
Good, pit trap
Missing leg #1, Pit trap
Good , Minnow trap
Good
Good
Good
Good
Good
Good
Missing # 6,7,8,9; trap fished for > 30 days
Missing 1, brought in by Ekone
Weggs, brought in by Ekone
Missing 1 and 6, Ekone
Missing 8, brought in by Ekone
Missing 3, brought in by Ekone
WDFW moving shell bags
WDFW moving Shell bags
Good
Good
Dick Wilson,, missing a few legs
good
Missing limb# 7
Missing limb #1 and 2
37
Appendix 4. Relative abundance (CPUE) and size of young-of-the-year Carcinus maenas at
the end of their first growing season in Oregon and Washington estuaries. Crabs were
typically caught in September. Catch per unit effort (CPUE) is reported as number of
crabs per trap per day. N=number of young crabs sampled; SD=Standard Deviation,
Water temperatures for December-March for the Hatfield Marine Science Center Pump
Dock in Yaquina Bay were provided by David Specht of the Newport EPA; those for
Willapa Bay, by Jan Newton and Judah Goldberg of the DOE.
Year
Class
Estuary
2002
2003
2004
2005
2006
1998
1999
2000
2001
2002
2003
2004
2005
2006
2002
2003
2004
2005
2006
2002
2003
2004
2005
2006
1998
1999
2000
2001
2002
2003
2004
2005
2006
Coos
Yaquina
#
Months
<10oC
0
4
3
3
4
0
3
2
3
Mean
Winter
Temp.
o
C
10.9
9.0
9.5
9.5
9.2
10.5
9.9
10.3
9.8
Netarts
Tillamook
Willapa
3
4
4
5
4
3
5
3
8.9
7.6
8.0
8.0
7.6
9.0
8.6
9.0
N
0
1
0
2
17
201
13
14
CPUE
Pitfall
traps
CPUE
Minnow
traps
0
0.01
0
0.05
0.32
5.0
0.20
1
9
4
21
18
0
6
0
25
21
0
5
2
10
31
47
3
9
7
0
10
0.778
0.023
0.046
0.046
0.0
0.167
106
5
0.37
0.04
0.75
Mean
Carapace
Width
(mm)
SD
Range
4.6
5.0
5.0
5.0
44-46
36-52
32-60
30-47
30-45
5.5
5.1
8.4
5.9
41-59
32-43
28-46
34-51
3.7
45-55
5.3
5.3
30-53
29-50
3.1
4.5
4.4
4.0
7.5
12.0
2.7
46-55
37-45
42-56
31-51
37-55
32-47
19-58
48-56
5.1
43-59
3.3
5.1
34-52
35-49
59.4
45.0
43.5
46.9
38.0
37.5
0.31
Not sampled
0.01
38.9
0.07
44.9
0.07
35.3
0.14
41.0
42.6
0.20
0.0
0.15
49.4
0
42.9
0.92
38.6
0.65
0
0.17
50.0
0.10
41.0
0.17
47.8
40.7
0.32
45.9
0.74
0.0
38.2
0.03
43.4
0.02
51.3
0.0
0.0
48.3
Not sampled
46.1
1.17
0.13
42.5
38
1998
1999
2000
2001
2002
2003
2004
2005
2006
Grays Harbor
3
24
3
1
0
1.00
0.024
0.01
0.01
0
45.3
37.4
41.3
47.9
2
1
Not Sampled
Not Sampled
0.03
47.3
0.02
49.0
5.0
7.7
6.5
40-50
34-51
35-48
44-50